Supernatural's sixth season comes to an end, with the first appearance of... H.P. Lovecraft! And The Big Bang Theory's season finale features Star Trek salaciousness. Plus Maria Hill vs. Hydra, Chuck's big day, and Family Guy Return of the Jedi!

Not to mention more Doctor Who and Game of Thrones. Plus the return of Nikola Tesla to Sanctuary, and Sinbad's final showdown with a Minotaur. Yes, you read that right. It's all part of a nourishing week of science fiction and fantasy television!

Today:

Syfy is having a marathon of The Sentinel all day long.

And the Cartoon Network debuts a whole new show, the UK-produced Amazing World of Gumball, at 7:30 PM:

The series combines 2D and 3D animation in a live-action setting and follows the misadventures of 12-year-old Gumball and his family in the wonderful little town of Elmore. Featuring a stellar cast of characters, Gumball's school friends include a T-Rex, a cheerleading peanut and a banana.

That's followed at 8:30 by a new episode of Regular Show, in which "Mordecai and Rigby want to go see wrestling, but they have to take care of Pops."

At 8:30 PM, there's a new Mad:

When a man bounces his father, Christopher Robin hires the toughest marshal in the west to track him down: Winnie The Pooh! Then Hannah Montana learns she's lost all her fans – to Justin Bieber! Plus Spy vs. Spy, Alfred E. Neuman and more!

And then at 8:45, there's a new Problem Solverz, in which "The Problem Solverz are enlisted by the delightful Sweetie Creamy to stop her father from blowing-up his own ice cream factory. Meanwhile, Horace is under Sweetie's spell — or is it her hypnotic ice cream?"

Also at 8, there's the season finale of Chuck on NBC, "Chuck Vs. The Cliffhanger": "Before he can kiss the bride, Chuck (Zachary Levi) must enlist his wedding party to take down Vivian Volkoff (guest star Lauren Cohan) and stop her from destroying the big day. When he turns to Alexei Volkoff (guest star Timothy Dalton) for help, the CIA sends its toughest agent, Clyde Decker (guest star Richard Burgi), to stop them." And here are a couple clips.

Also at 8 PM: a new House on Fox.

At 9 PM, NBC has the penultimate episode of The Event, "The Beginning of the End."

President Martinez (Blair Underwood) makes a triumphant albeit shaky return to the White House, determined to punish the traitors who conspired against him. Sophia (Laura Innes) forges ahead with her plan, while battling a new enemy — the guilt that has begun to plague her. Sean (Jason Ritter) and Vicky (Taylor Cole) form an impromptu team with Sterling (Zeljko Ivanek) and Simon (Ian Anthony Dale) in order to track down Sophia's headquarters and stop her before the destruction of all human life.

Tuesday:

At 7:30 PM, the Cartoon Network has another new Scooby-Doo: Mystery Inc., "Where Walks Aphrodite." That's followed at 8 PM by another episode of the weird sitcom The Looney Tunes Show, "The Jailbird and Bunny."

Similar to the way doctors use X-rays to diagnose unseen medical problems, scientists are using an army of sensors located underground, in the sky, the ocean and our cities to monitor the Earth more than at any other time in our history. From the undisturbed far reaches of the planet to the busiest cities on the globe, X-RAY EARTH uses technology and CGI to give us a new view of our world.

A third option at 8 PM: PBS is having a special called Secrets of the Dead: The World's Biggest Bomb.

Beginning in the 1950s, American and Soviet scientists engaged in a dangerous race to see who could build and detonate the world's largest bomb.

Late night movie: TMC is showing A Boy and his Dog, the ultra-twisted post-apocalyptic Harlan Ellison movie adaptation, at 1:30 AM.

Wednesday:

At 9 PM, Discovery Channel has another new Mythbusters, "Spy Car 2."

Jamie and Adam test whether tire spikes can take another car out, while Kari, Grant and Tory test whether a bullet shot at ice will just spin.

And a new South Park is on Comedy Central at 10 PM.

Thursday:

Terminator: The Sarah Connor Chronicles is unexpectedly back on Syfy — the channel is running T:SCC episodes all day and all night — so it's a great chance to get caught up if you missed part of this amazing series.

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At 8 PM, there's the season finale of Big Bang Theory on CBS, "The Roommate Transmogrification":

When Bernadette receives her Ph.D., the guys take joy in reminding an emasculated Wolowitz that he is the only one in their group who isn't a doctor. Meanwhile, Koothrappali becomes Sheldon's new roommate after hearing Leonard and Priya engaging in a "Star Trek" bedroom fantasy.

Using an unprecedented combination of the most current scientific information, mind-blowing computer graphics and relatable analogies and comparisons, the Known Universe gives vital insights into a world we thought we knew.

Friday:

Supernatural has its final two episodes of the season, back to back. First, in "Let it Bleed": "A demon kidnaps Ben (guest star Nicholas Elia) and Lisa (guest star Cindy Sampson) to get to Dean (Jensen Ackles). Sam (Jared Padalecki) and Dean are forced to join with an unlikely ally to free them." And then, in "The Man Who Knew Too Much," "The wall comes down in Sam's (Jared Padalecki) head and all hell breaks loose. Dean (Jensen Ackles) and Bobby (Jim Beaver) are, for once, at a total loss on how to help him and are forced to stand by and do nothing while Sam breaks. The battle for heaven comes to a head."

At 10 PM, Camelot is back on Starz.

Saturday:

The Hub is having its random grab-bag of Transformers and G.I. Joe cartoons as usual from 7 to 9 PM.

At 9 PM, BBC America has a new episode of Doctor Who, "The Rebel Flesh" by Matthew Graham. It's the first half of a two-parter. In which:

A solar tsunami sends the TARDIS hurtling towards a futuristic factory on Earth, where human doppelgangers are used to mine dangerous acid, as the time-travelling adventures continue. A second wave hits and the "Gangers" separate. They can remember every second of their "original's" life and feel every emotion they've ever experienced. But are these memories stolen or have they been bequeathed? Are the Gangers merely faulty machinery that must be shut down or are they living, breathing, sentient beings? Can the Doctor convince the terrified humans to accept these "almost people" and prevent an all-out civil war before the factory explodes?

But if you're not feeling up for more Who, then Syfy has you covered, with a new TV movie at 9 PM: Sinbad & the Minotaur. It's got everything: sailors, belly-dancing, swashbuckling, mythology and dodgy CG!

Manu Bennett plays the title role in Sinbad and the Minotaur, premiering Saturday, May 21, at 9PM (ET/PT) on Syfy. Sinbad and his men search tirelessly for the lost treasure of the Colossus of Rhodes, which is guarded by a terrifying Minotaur. Along the journey, Sinbad meets Princess Tara, a slave in the evil sorcerer Al-Jibar's harem. Now Sinbad must find the treasure, rescue the Princess and conquer the Minotaur, while defeating the enraged sorcerer.

Sunday:

Hydra and A.I.M. are waging war against one another in the streets of New York, and only one person knows why... the Black Widow. But the Avengers have another problem... they've just been grounded by S.H.I.E.L.D., now under the control of Maria Hill.

Fox has its usual animated bloc from 7:30 to 10, with the season finales of American Dad, The Simpsons, Bob's Burgers and Family Guy. And the one-hour Family Guy season finale, airing at 9 PM, is called "Episode VI: It's a Trap, Parts 1 & 2." What could that be?

Return to the Griffins' version of that galaxy far, far away as their freakin' sweet saga continues with the final installment of the hilarious three-part "Star Wars" satire. Following 2005's "Family Guy: Blue Harvest" and last year's "Family Guy: Something, Something, Something Dark Side," the Griffins reprise their intergalactic roles in an outrageous retelling of "Star Wars, Episode VI: Return of the Jedi"

The mega-tsunami that swallowed entire villages in Japan, the devastating earthquake that rocked Haiti and even the terrorist attack on New York's Twin Towers remind us about the critical importance of emergency response plans. But what would happen if humanity were faced with its ultimate challenge - a hostile alien invasion? How would top governments unite to fight against a technologically superior alien armada, and what steps could mankind take to ensure its survival? In When Aliens Attack, experts predict the possible impact of contact with an advanced alien race. Astrophysicists, weapon designers, military strategists, biologists and anthropologists break down the likely sequence of events mankind would face, and collaborate on ways to survive an extraterrestrial attack. "In the case of a global invader … the United States has a multitude of plans."

HBO's Game of Thrones has its sixth episode at 9 PM, called "A Golden Crown." And you know what that means: Viserys is finally getting his reward! Any minute now, he'll be marching back into Westeros at the head of an unstoppable Dothraki fighting force, and nobody will ever again make fun of his hair. That is what happens... right? Here's the synopsis, anyway:

While King Robert goes hunting, Ned has to deal with new problems. At the Eyrie, Tyrion faces judgment for his crimes. In Vaes Dothrak, Viserys finally gets his payment for giving his sister's hand in marriage to Khal Drogo.

Alien spacecraft darting across the skies. Strange orbs hovering in midair. And little green men. Conspiracy theorists have long believed Area 51 harbored proof of extraterrestrials. Now, new firsthand insight into the top secret facility reveals surprising truths to those theories. Area 51 Declassified was produced in association with Annie Jacobsen, author of the new book "Area 51: An Uncensored History of America's Top Secret Military Base," which draws on the very first credible interviews with insiders, including more than 50 scientists, pilots and engineers. This first-person testimony reveals some of the secret military defenses tested on the base and other activities that until now have remained classified. Further details are embargoed until the book's release on May 17, 2011, but even then we may never know the whole truth. One veteran admits in his interview, "I can tell you only about 5 percent of what really went on."